JPS5850934A - Photographing apparatus for endoscope - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an imaging device for an endoscope, especially an imaging device for an endoscope in which an imaging optical system is made of optical fibers of a refractive index distribution type.

Conventionally, an endoscope has an imaging optical system consisting of one or more lenses at its distal end, an optical fiber bundle O1IllIIw called an image guide placed near the imaging plane, and nine illumination lights introduced from an external light source. is configured to irradiate the subject from one end of an optical fiber bundle called a light guide from this tip. The other end of the image guide is guided to the operating section and provides the object to be observed by the eyepiece optical system. Since optical fiber bundles are generally flexible, there is limited flexibility when inserting them into human body cavities, and each optical fiber has a diameter of 10 degrees, so it can be easily inserted into a human body cavity. It has the advantage that images can be observed with relatively high image quality. However, in the case of an image guide, approximately 10,000 optical fibers must be aligned within a diameter of several 8 m, and therefore the individual lenses of the imaging optical system are also minute. Coupled with the reduction in image transmission efficiency due to breakage of the light guide, it is extremely difficult to manufacture such endoscopes in large quantities at low cost.

Therefore, the present invention seeks to provide an endoscopic imaging device that does not have the above-mentioned drawbacks.

According to the present invention, an endoscope imaging device includes a distal end portion that can be inserted into a cavity such as a living body cavity, a refractive index distribution optical fiber arranged at the distal end portion and forming an imaging optical system, and a distal end portion that can be inserted into a cavity such as a living body cavity. An optical element disposed behind the light exit end surface of the optical fiber and a solid-state image sensor disposed behind the optical element 1B, the optical fiber bundle and the solid-state image sensor are integrally attached to the optical element, and the optical element is K is formed to form a retaining substrate that is attached to the tip. In addition, in the structure of the present invention described above, the optical element can be formed to include a force 2-mosaic filter or a color stripe filter.

With the above configuration, the refractive gradient optical fiber that is the imaging optical system, the optical element, and the solid-state image sensor are integrated into a unit, which conventionally required extremely advanced manufacturing technology and high cost. No, there is no need for an image guide, and therefore there are advantages such as no need to worry about breakage of the optical fiber bundle, which conventionally determined the life of an endoscope. Also, due to the above-mentioned unitization, it is extremely difficult to attach these parts to the endoscope.CRT? In combination with YouTube monitor TV, it is possible to accurately and clearly monitor the subject.
Another advantage is that IK observation is possible.

Hereinafter, this invention will be described in detail according to the embodiments shown in the accompanying drawings.
KI! I will clarify.

In the drawings, only the distal end portion 2 of the endoscope 1 is shown in a rounded shape for ease of illustration), and a holding substrate 3, which is an optical element, is attached to the holding portion thereof. In front of the holding base I [3, an optical fiber 4 of a shoulder-folding type is fixed, and the front end of the optical fiber 114 faces the front of the distal end portion 2, as is clear from the figure. - A solid-state image pickup device is fixed to the rear of the holding board 4, and arranged so that the photoelectric conversion signal of the subject il is sent to the preamplifier 6 and the output channel 1.

On the side of the refractive index distribution optical fiber chamber 4, one end 9 of a light guide 8 made of an optical fiber bundle, which is an illumination optical system, is arranged, and the other end 1eFi is connected to the endoscope 1 as is well known in the art. The light from the light source 11 is led outside to illuminate a subject (not shown).

, the refractive index gradient optical fiber number has a diameter of 0.5 to S ■ degree, the length is 26, the focusing parameter representing the strength of the distribution is g1, the refractive index on the optical axis is n, from the end surface If the distance to the focal point is 81 and the refractive index of the optical element 3 is ns, then it is expressed as 111eg 2 . Therefore, by appropriately selecting the dimensions corresponding to each symbol in the above formula, it is possible to form an image of a subject (not shown) on the barrel of the solid-state imaging device 6.

Note that the light source 11 is a white light source, and the optical element (holding substrate)
If the IK red, blue, and blue color J & Puik filters or acid cut stripe filters are included, the signal read out from the solid-state image sensor will be converted into NT80 Kafute, Sibi signal, or red, green, and blue color by the Purcess circuit IK. The signal is converted into a television signal, allowing the viewer of the TV 12 to view the l-image.

[Brief explanation of the drawing]

The drawing is a configuration diagram of an embodiment of an endoscope imaging device according to the present invention. DESCRIPTION OF SYMBOLS 1... Endoscope, 2... Tip part, 3... Optical element,
4... Optical fiber with refractive index distribution, 3... Solid-state imaging device 9 Applicant: Fuji Photo Co., Ltd. Fig. 1-209

Claims (1)

[Scope of Claims] (1) A distal end portion that can be inserted into a cavity such as a living body cavity, a gradient index optical fiber disposed at the wrinkled distal end portion and forming an imaging optical system, and the optical fiber. an optical element disposed behind the light emitting end and a solid-state imaging element disposed behind the optical element; the optical fiber and the surface-shaped imaging element are integrally attached to the optical element; An imaging device for an endoscope, wherein the optical element is formed as a holding substrate attached to the distal end portion. (3) The apparatus according to claim 1, wherein the optical element includes at least a cut-mosaic filter. (3) The apparatus according to claim 1, wherein the optical element includes at least a color stripe filter.